mtg booster box sealed Magic - Reality Fracture Collectors Display (12 Packs) Open hundreds of cards Magic The Gathering Dragon's Maze

The most impactful that Id personally pick would be: Deflecting Swat, which is always good when you need to protect a Commander that attacks for value and damage

These sleeves minimize surface scratches and damage to your cards during storage or display

It is more versatile and less linear due to the Chaos Dragons

It even hits those niche effects that XYZ Monsters sometimes have that attach cards from the graveyard as material

As for the Pikachu, theres no rational explanation

Special Summon 1 Tuner and 1 or more non-Tuners from your GY, whose total Levels equal the targeted monster's, and if you do, they cannot be destroyed by battle or card effects this turn